HEYDAY is a playable word

heyday Scrabble® Dictionary

noun
pl. heydays
the period of one's greatest success
35 Playable Words can be made from "HEYDAY"
   2-Letter Words (12 found)
   3-Letter Words (14 found)
   4-Letter Words (5 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)